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Cummins/Onan DYH 250 kW Series Generator Set

The Cummins/Onan DYH 250 kW Series is a 250 kW ASTM No. 2 Diesel standby generator set powered by a Allis-Chalmers 6138T engine. It is available at 60 V and 50 V, single-phase and 60 Hz. It holds about 15 L (4.0 gal) of oil and 16.5 L (4.4 gal) of coolant. Starting uses 2 group-2 batteries at 24 V. The set measures 2768×1117×1778 mm (109.0×44.0×70.0 in) and weighs about 2951 kg (6506 lb).

250 kW
Standby
13.8 L
Displacement
15.0 L
Oil capacity
1
Document types

How to read your Cummins/Onan serial & model number →

Typical fuel consumption for 250–255 kW Diesel generators →

Compare with other 250–255 kW Diesel generators →

Service parts for the DYH 250 kW Series

Grouped by system, with how many of each the parts manual calls for.

Air intake

1 required

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

FuelASTM No. 2 Diesel
Frequency60.0 Hz
Standby power250 kW
ControllerEngine Monitor Printed Circuit Plug-in Modules
Oil capacity15.0 L
AlternatorYB 17
Voltage options60 V, 50 V
PhaseSingle Phase
Power factor0.8
Battery group2 x 12V, 225 Ah
Battery voltage24 V
Battery quantity2
Coolant capacity16.5 L
Dimensions (L×W×H)2768×1117×1778 mm
Dry weight2951 kg

Engine

Allis-Chalmers 6138T
Displacement13.8 L
AspirationN/A
Rated speed1800 rpm

Maintenance & consumables

for the Allis-Chalmers 6138T
ItemSpecCapacityPart #Interval
Air filterReplace or clean when plugged, or in accordance with service maintenance instructions.M-11901000 hr Amazon eBay
Fuel filter—500 hr
Oil filter—1000 hr
Battery—500 hr
Belt—1000 hr
Coolant—3 hr
Oil—
Spark plug—1000 hr

Common questions

What is the power rating of the Cummins/Onan DYH 250 kW Series?

The Cummins/Onan DYH 250 kW Series is rated 250 kW standby.

What engine is in the Cummins/Onan DYH 250 kW Series?

The Cummins/Onan DYH 250 kW Series is powered by the Allis-Chalmers 6138T engine.

What fuel does the Cummins/Onan DYH 250 kW Series use?

The Cummins/Onan DYH 250 kW Series runs on ASTM No. 2 Diesel.

What is the cooling system capacity of the Cummins/Onan DYH 250 kW Series?

The Cummins/Onan DYH 250 kW Series cooling system holds 16.5 liters (4.4 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.

What is the oil capacity of the Cummins/Onan DYH 250 kW Series?

The Cummins/Onan DYH 250 kW Series has an engine oil capacity of 15 liters (15.9 US quarts), per the manufacturer specification sheet.

How much does the Cummins/Onan DYH 250 kW Series weigh?

The Cummins/Onan DYH 250 kW Series has a dry weight of 2951 kg (6505 lb).

What voltage does the Cummins/Onan DYH 250 kW Series produce?

The Cummins/Onan DYH 250 kW Series is offered in 60 V, 50 V, Single Phase-phase.

What battery does the Cummins/Onan DYH 250 kW Series use?

The Cummins/Onan DYH 250 kW Series uses 2 batteryies, 24 V each, group 2 x 12V, 225 Ah, per the manufacturer specification sheet.

What alternator comes on the Cummins/Onan DYH 250 kW Series?

The Cummins/Onan DYH 250 kW Series uses a YB 17 alternator.

What air filter does the Cummins/Onan DYH 250 kW Series use?

The Cummins/Onan DYH 250 kW Series uses air filter part number M-1190.

Troubleshooting

6

Symptoms & remedies

SymptomCauseRemedy
Engine stops cranking and fault lamp lights, after cranking approximately 75 secondsSee engine service manual for troubleshooting fuel system; After correcting problem, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset, then back to the required running position.
Fault lamp lights immediately after engine startsOverspeed condition as engine startsCheck for overspeed condition as engine starts.
Fault lamp lights and engine shuts down after running for a periodOil level (engine will shut down if sensor is closed)Check oil level.
Fault lamp lights and engine shuts down after running for a periodOil system faultCheck engine manual for troubleshooting oil system.
Fault lamp lights and engine shuts down after running for a periodHigh engine temperatureCheck coolant level; check water flow (city water cooled systems); check radiator for free air flow, and fan belts for tightness; See engine manual for troubleshooting cooling system.
Fault lamp lights and engine shuts down after running for a periodFaulty oil pressure sensor or faulty high engine temperature sensorCheck for faulty oil pressure sensor or faulty high engine temperature sensor.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan DYH 250 kW Series troubleshooting guide (18 entries) →

Parts

3
Part #DescriptionQtySystem
M-1190AIR FILTER1Air filter Amazon eBay
M-1191ENGINE HEATERWater Amazon
M-1189ENGINE HEATERService part / kit Amazon eBay

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

RatingLoadL/hgal/h
Standby71.9219.0

Available documents

Service manual — 973-0125 Onan DYH Operator's Manual (8-1981) (Cummins/Onan)

This page was generated from the 1 manufacturer document above by automated extraction; every figure shown is copied from one of them. How the data is compiled.